93268 cpt code Descriptions, Guidelines And billing

I. Introduction to CPT Code 93268

CPT Code 93268 is a specific code used for cardiovascular monitoring services. In this article, we will delve into the definition and purpose of CPT codes, emphasize the importance of accurate coding and billing, and provide an overview of cardiovascular monitoring services.

A. Definition and purpose of CPT codes

CPT codes, or Current Procedural Terminology codes, are a standardized system of medical codes used to describe medical procedures, services, and treatments. These codes play a vital role in medical billing and coding, as they provide a universal language for healthcare professionals and insurance companies to communicate and process healthcare claims.

CPT Code 93268, specifically, refers to cardiovascular monitoring services. It encompasses the use of long-term monitors by patients to record suspected or paroxysmal dysrhythmias, which are abnormal heart rhythms. The recorded data is then transmitted to a physician’s office or a specified station for assessment and management [1].

B. Importance of accurate coding and billing

Accurate coding and billing are of utmost importance in the healthcare industry. Proper coding ensures that medical procedures and services are appropriately documented, enabling healthcare providers to receive fair reimbursement for the services rendered. It also helps in maintaining compliance with regulatory requirements and streamlines the claims submission process.

For cardiovascular monitoring services, accurate coding is crucial to ensure that healthcare providers receive appropriate reimbursement for the time and resources invested in monitoring patients’ heart rhythms. It also facilitates efficient communication between healthcare professionals, insurance companies, and other stakeholders involved in the healthcare revenue cycle.

C. Overview of cardiovascular monitoring services

Cardiovascular monitoring services, as encompassed by CPT Code 93268, involve the use of long-term monitors by patients to record suspected or paroxysmal dysrhythmias. These monitors are typically worn by patients for a duration of 10-14 days or more, and the recorded data is transmitted to a physician’s office or a specified station for evaluation and management.

The purpose of cardiovascular monitoring services is to detect and analyze transient arrhythmias, regulate anti-arrhythmic drug dosage, and investigate unexplained syncope or dizziness. This monitoring is especially important for patients who may be at risk of cardiovascular conditions or those experiencing symptoms that require closer observation and analysis.

It is worth noting that coordination with other diagnostic tests may be necessary to provide a comprehensive evaluation of a patient’s cardiac health. Additionally, the monitoring service must be attended 24/7 to ensure accurate data collection and patient safety. These services should be ordered by a physician or a qualified non-physician practitioner who is treating the patient [1]

In conclusion, CPT Code 93268 represents cardiovascular monitoring services that involve the use of long-term monitors to record suspected or paroxysmal dysrhythmias. Accurate coding and billing are essential in healthcare to ensure proper reimbursement and compliance with regulatory requirements. By understanding the purpose and importance of CPT codes, as well as the overview of cardiovascular monitoring services, healthcare professionals can effectively navigate the complexities of medical billing and coding in relation to this specific code.

II. Understanding CPT Code 93268

Cardiovascular monitoring plays a crucial role in assessing the cardiac health of patients and providing accurate diagnoses. CPT Code 93268 is specifically designated for cardiovascular monitoring services, encompassing various components and documentation requirements. In this article, we will delve into the details of CPT Code 93268, its description, the components included in cardiovascular monitoring services, appropriate use cases, and documentation requirements for accurate coding.

A. Description of CPT Code 93268

CPT Code 93268 represents the comprehensive provision of cardiovascular monitoring services. This code covers the evaluation and management of cardiac activity through the use of advanced monitoring techniques. Healthcare professionals utilize this code to bill for the time and resources invested in analyzing and interpreting data obtained from cardiovascular monitoring.

B. Components included in cardiovascular monitoring services

1. Electrode placement and lead attachment

The initial step in cardiovascular monitoring involves the meticulous placement of electrodes and attachment of leads to the patient’s body. Electrodes serve as the interface between the patient and the monitoring equipment, capturing electrical signals generated by the heart. Accurate electrode placement and secure lead attachment are essential for obtaining reliable data [2].

2. Continuous monitoring equipment

Continuous monitoring equipment plays a pivotal role in capturing and recording cardiac activity over an extended period. This equipment includes sophisticated devices capable of recording electrocardiograms (ECGs) and other pertinent data. Continuous monitoring facilitates the detection of arrhythmias, irregular heartbeats, and other cardiac abnormalities [3]

3. Analysis and interpretation of data

Once the data is collected, healthcare professionals carefully analyze and interpret it to identify any abnormalities or patterns. This analysis involves examining the recorded ECGs, evaluating heart rate variability, and assessing other relevant parameters. The data interpretation helps in formulating accurate diagnoses and developing appropriate treatment plans [3]

C. Appropriate use cases for CPT Code 93268

CPT Code 93268 is employed in several clinical scenarios where cardiovascular monitoring is necessary. Some common use cases include:

1. Detecting arrhythmias: The monitoring service helps in identifying various types of arrhythmias, such as atrial fibrillation, ventricular tachycardia, and bradycardia. Accurate detection of these abnormalities aids in determining the most suitable treatment approach [3]

2. Regulating drug dosage: In patients receiving cardiac medications, continuous monitoring assists in monitoring the effectiveness of the prescribed drugs. Adjustments to the dosage can be made based on the recorded data, ensuring optimal therapy [3].

3. Investigating unexplained symptoms: When patients experience unexplained symptoms such as palpitations, dizziness, or syncope, cardiovascular monitoring provides valuable insights into the underlying cause. It aids in identifying any cardiac abnormalities contributing to these symptoms [3]

D. Documentation requirements for accurate coding

Accurate documentation is essential for proper coding and billing of cardiovascular monitoring services using CPT Code 93268. Healthcare providers should ensure the following:

1. Comprehensive medical records: Detailed documentation of the patient’s medical history, symptoms, and any relevant physical examination findings is crucial. This information provides context for the necessity of cardiovascular monitoring [4].

2. Order by treating physician: The service must be ordered by the treating physician, clearly indicating the medical necessity for cardiovascular monitoring. This documentation supports the justification for the procedure and subsequent reimbursement [3]

3. Exclusive-use basis: Each patient should have exclusive use of the monitoring equipment throughout the designated monitoring period. Sharing the equipment between patients or overlapping monitoring periods for multiple patients is not allowed [3]

It is crucial for healthcare professionals to adhere to these documentation requirements to ensure accurate coding and reimbursement for cardiovascular monitoring services [4]

In conclusion, CPT Code 93268 encompasses various aspects of cardiovascular monitoring services. It includes electrode placement, continuous monitoring equipment, data analysis and interpretation, appropriate use cases, and documentation requirements. Understanding the intricacies of this code is crucial for accurate coding, billing, and reimbursement for cardiovascular monitoring services in healthcare settings.

III. Guidelines for Billing CPT Code 93268

Cardiovascular monitoring services are essential for evaluating and managing cardiac conditions. Proper billing and coding for these services are crucial to ensure accurate reimbursement and avoid potential errors. This article will provide comprehensive guidelines for billing CPT code 93268, covering Medicare guidelines, private payer variations, and common billing and coding errors to avoid.

A. Medicare Guidelines for Cardiovascular Monitoring Services

1. Coverage Criteria and Medical Necessity

When billing CPT code 93268 for cardiovascular monitoring services to Medicare, it is important to adhere to their coverage criteria and establish medical necessity. Medicare defines medical necessity as services or items that are reasonable and necessary for the diagnosis or treatment of an illness or injury. To meet Medicare’s coverage criteria, the following requirements must be fulfilled:

– The patient must have a documented cardiac condition or symptoms warranting cardiovascular monitoring.

– The monitoring must be ordered by a qualified healthcare professional.

– The monitoring equipment used should be FDA-approved.

– The duration of monitoring should align with the medical necessity and clinical indications.

2. Documentation Requirements for Reimbursement

Accurate and detailed documentation is essential for proper reimbursement when billing CPT code 93268 to Medicare. The documentation should include:

– The medical necessity and clinical indications for the cardiovascular monitoring.

– The physician’s order for the monitoring services.

– The duration of monitoring and the reason for its length.

– Any relevant test results, diagnostic reports, or previous treatments.

– The patient’s medical history and any comorbidities that may impact the monitoring.

By ensuring thorough documentation, healthcare providers can support the medical necessity of the service and prevent potential denials or audits.

B. Private Payer Guidelines and Variations

Private payers may have different reimbursement policies and coverage criteria for cardiovascular monitoring services. It is essential to be aware of these variations and comply with the specific guidelines of each payer. Some key considerations include:

1. Different Reimbursement Policies and Coverage Criteria

Private payers may have specific criteria for coverage and reimbursement of CPT code 93268. These criteria may include patient age restrictions, specific medical conditions requiring monitoring, or limitations on the duration and frequency of monitoring. It is important to review each payer’s policies and ensure compliance to avoid claim denials or underpayment.

2. Prior Authorization Requirements and Claim Submission Guidelines

Certain private payers may require prior authorization for cardiovascular monitoring services. Healthcare providers should be aware of these requirements and ensure that the necessary authorizations are obtained before providing the services. Additionally, understanding the specific claim submission guidelines of each private payer is crucial to ensure accurate and timely reimbursement.

C. Common Billing and Coding Errors to Avoid

To minimize claim denials and optimize reimbursement, healthcare providers must be vigilant about avoiding common billing and coding errors when submitting claims for CPT code 93268. Some key errors to avoid include:

1. Upcoding or Incorrect Code Selection

Using incorrect codes or upcoding (i.e., assigning a higher-value code than justified) can lead to claim denials and potential legal consequences. It is crucial to accurately select the appropriate CPT code for the specific cardiovascular monitoring services provided and ensure documentation supports the code selection.

2. Insufficient Documentation Leading to Denials

Inadequate documentation is a common reason for claim denials. Insufficient documentation may include missing or incomplete medical records, lack of supporting documentation for medical necessity, or failure to include required elements such as the physician’s order or test results. Healthcare providers should establish proper documentation processes to ensure all necessary information is captured.

3. Compliance with Coding and Billing Regulations

Healthcare providers must comply with coding and billing regulations set forth by government agencies, such as the Centers for Medicare and Medicaid Services (CMS) and private payers. Staying updated with changes in coding guidelines, maintaining compliance programs, and conducting regular audits can help identify and rectify any potential compliance issues.

In conclusion, billing CPT code 93268 for cardiovascular monitoring services requires adherence to specific guidelines. By following Medicare guidelines for coverage criteria and documentation requirements, understanding private payer variations, and avoiding common billing and coding errors, healthcare providers can optimize reimbursement and ensure compliance with coding and billing regulations.

Note: The information provided in this article is based on current guidelines and regulations available as of 2023-07-04 and may be subject to change. It is always recommended to refer to the latest official sources and consult with coding and billing experts for specific cases or updates.

IV. Reimbursement and Coding Tips for CPT Code 93268

In the world of medical billing and coding, it is crucial to have a deep understanding of the reimbursement and coding guidelines associated with various CPT codes. One such code that requires attention to detail is CPT Code 93268, which pertains to cardiovascular monitoring services. This article aims to provide comprehensive insights and tips on reimbursement and coding strategies for healthcare professionals dealing with CPT Code 93268.

A. Understanding the Fee Schedule and Payment Rates:

To navigate the reimbursement landscape effectively, healthcare providers must familiarize themselves with the fee schedule and payment rates related to CPT Code 93268. The fee schedule outlines the predetermined payment amounts set by payers for specific medical services [4]. It is crucial to stay updated with the latest fee schedules to ensure accurate billing and maximize reimbursement. By understanding the payment rates, providers can make informed decisions regarding patient care and financial viability.

B. Proper Use of Modifiers and Their Impact on Reimbursement:

Modifiers play a vital role in medical billing and coding, and their correct usage is paramount to ensure accurate reimbursement. When it comes to CPT Code 93268, certain modifiers may be applicable to indicate specific circumstances or unique situations. For example, the use of modifier -59 can distinguish separate and distinct procedures performed during the same encounter, thereby justifying separate reimbursement [4]. It is crucial to understand the guidelines provided by the payer regarding modifier usage and ensure compliance with the documentation requirements to avoid claim denials or audits.

C. Linking Appropriate Diagnosis Codes with CPT Code 93268:

Accurate linking of diagnosis codes with CPT Code 93268 is essential for appropriate reimbursement and documentation integrity. Healthcare providers must be well-versed in the common ICD-10-CM codes used in conjunction with CPT Code 93268 to ensure accurate and specific reporting of the patient’s condition [5]. Some commonly used ICD-10-CM codes for cardiovascular monitoring services include:

1. I10 – Essential (primary) hypertension

2. I20.0 – Unstable angina

3. I25.10 – Atherosclerotic heart disease of native coronary artery without angina pectoris

4. I48.91 – Unspecified atrial fibrillation

5. I50.23 – Diastolic (congestive) heart failure

It is important to note that using mismatched code combinations can lead to claim denials and payment delays. Healthcare providers must be cautious and avoid such code combinations to ensure accurate representation of the patient’s condition and appropriate reimbursement [5]. By following the correct coding guidelines and using the appropriate ICD-10-CM codes, providers can mitigate risks associated with claim denials and ensure smooth reimbursement processes.

V. Documentation and Medical Necessity for CPT Code 93268

Proper documentation and medical necessity play a crucial role in the accurate billing and coding of medical procedures. In the case of cardiovascular monitoring, specifically CPT Code 93268, adherence to medical necessity requirements and comprehensive documentation is essential for successful reimbursement and effective patient care.

A. Medical necessity requirements for cardiovascular monitoring:

1. Diagnosis verification:

   – To ensure medical necessity for cardiovascular monitoring, healthcare providers must establish a valid diagnosis. This involves identifying conditions such as arrhythmias, unexplained syncope, or dizziness that warrant monitoring [3].

   – Diagnostic confirmation should be based on the patient’s medical history, physical examination, and other relevant tests.

   – Documentation should clearly indicate the medical necessity for monitoring and its potential impact on patient management and treatment outcomes.

2. Appropriate indications:

   – Cardiovascular monitoring is indicated in situations where the detection and documentation of arrhythmias are necessary.

   – It is also used to regulate the dosage of anti-arrhythmic drugs and investigate unexplained episodes of syncope or dizziness [3].

   – The documentation should provide a detailed explanation of the clinical indications justifying the need for cardiovascular monitoring.

   – Clinical evidence supporting the decision to order monitoring should be documented, including the patient’s symptoms and relevant diagnostic findings.

B. Elements of comprehensive documentation:

1. Patient demographics and medical history:

   – Comprehensive documentation begins with accurate recording of patient demographics, including name, age, gender, and contact information.

   – The medical history section should capture relevant past medical conditions, surgeries, allergies, medications, and family history of cardiovascular diseases.

   – This information ensures a holistic understanding of the patient’s health status and aids in risk assessment and appropriate treatment planning.

2. Reason for monitoring and clinical indications:

   – Precise documentation of the reason for cardiovascular monitoring is crucial for establishing medical necessity.

   – The documentation should clearly state the specific symptoms, concerns, or diagnostic findings that necessitate monitoring.

   – Healthcare providers should provide detailed clinical indications, such as suspected arrhythmias, unexplained syncope, or dizziness, along with supporting evidence from physical examinations, EKGs, or other relevant tests.

3. Findings and interpretations:

   – Accurate and timely recording of monitoring findings is essential for effective patient management.

   – The documentation should include detailed descriptions of detected arrhythmias, their frequency, duration, and any associated symptoms.

   – Interpretations by qualified healthcare professionals, including physicians, should be documented to provide a comprehensive overview of the patient’s cardiovascular health status.

4. Physician’s or healthcare provider’s signature and credentials:

   – To ensure the validity and authenticity of the documentation, the physician or healthcare provider responsible for the monitoring should sign the relevant records.

   – The signature should be accompanied by the provider’s credentials, clearly indicating their qualifications and expertise in the field.

   – This information helps in verifying the authorship and ensures compliance with regulatory and billing requirements.

Disclaimer: The information provided in this article is for educational purposes only and should not be construed as medical advice. Please consult with a qualified healthcare professional for specific medical concerns or guidance.

VI. Resources for Accurate Coding and Billing

In the ever-evolving landscape of medical coding and billing, it is imperative for healthcare professionals to have access to reliable resources that aid in accurate coding and billing practices. This article will explore several valuable resources that can assist in navigating the complexities of cardiovascular monitoring services, CPT code information, denial reasons and code reference, as well as accessing relevant guidelines and coding manuals. By leveraging these resources, medical practitioners can ensure compliance, maximize reimbursement, and provide optimal patient care.

A. CMS Resources for Cardiovascular Monitoring Services

The Centers for Medicare and Medicaid Services (CMS) offer a range of resources to support healthcare providers in accurately coding and billing cardiovascular monitoring services. These resources provide crucial guidance to ensure compliance with Medicare guidelines and maximize reimbursement.

One notable resource is the CMS Medicare Coverage Database (MCD), which allows practitioners to access Local Coverage Determinations (LCDs) specific to cardiac event detection monitoring services [6]. The LCD provides comprehensive information, including effective dates, contractor details, and copyright information for relevant codes and materials. It emphasizes the importance of adhering to existing Medicare NCDs, payment policies, and regulatory requirements outlined in the Social Security Act.

B. AMA Resources for CPT Code Information

The American Medical Association (AMA) offers a wealth of resources for obtaining accurate and up-to-date information on Current Procedural Terminology (CPT) codes. These resources empower healthcare professionals to assign the appropriate codes for various medical services and procedures.

The AMA’s CPT Knowledge Center provides a centralized platform where practitioners can access coding guidance, FAQs, and educational materials. Additionally, the CPT Assistant, a trusted publication by the AMA, offers detailed explanations and clinical examples to enhance understanding and application of CPT codes. By utilizing these resources, healthcare providers can ensure accurate coding, streamline billing processes, and minimize claim denials.

C. AAPC Tools for Addressing Denial Reasons and Code Reference

The American Academy of Professional Coders (AAPC) offers an array of tools designed to assist healthcare professionals in addressing denial reasons and accessing relevant code references. These tools play a pivotal role in facilitating accurate coding, resolving claim denials, and optimizing revenue cycle management.

AAPC’s Denial Resolution Tools provide comprehensive resources to identify and address common denial reasons. These tools offer insights into denial codes, coding guidelines, and documentation requirements, enabling coders to rectify coding errors and resubmit claims successfully. Furthermore, AAPC’s Code Lookup Tool provides a user-friendly interface to search for accurate and detailed coding information, empowering coders to select the most appropriate codes for various medical services.

D. Accessing Relevant Guidelines and Coding Manuals

Staying updated on relevant guidelines and coding manuals is crucial for healthcare professionals involved in medical billing and coding. These resources serve as authoritative references for accurate coding practices and reimbursement policies.

For cardiovascular monitoring services, healthcare professionals can refer to resources provided by reputable organizations such as Abbott’s Cardiac Rhythm Management Resources [7]. These resources offer valuable insights into reimbursement considerations, although it is important to note that they do not provide specific code selection instructions. Practitioners should consult legal counsel or reimbursement specialists for any coding, billing, or reimbursement inquiries.

Additionally, resources specific to heart failure reimbursement are available, such as Abbott’s Heart Failure Resources for Medical Reimbursement [8]. These resources provide general information on reimbursement practices related to heart failure, but it is essential to remember that they do not constitute legal advice or provide specific coding instructions.

By leveraging these resources and staying informed about the latest guidelines and coding manuals, healthcare professionals can ensure accurate coding and billing practices, mitigate claim denials, and optimize revenue cycle management.

In conclusion, accurate coding and billing are critical components of healthcare operations. Access to reliable resources, such as CMS resources for cardiovascular monitoring services, AMA resources for CPT code information, AAPC tools for addressing denial reasons and code reference, and relevant guidelines and coding manuals, is essential for healthcare professionals to navigate the intricacies of medical coding and billing successfully. By utilizing these resources effectively, practitioners can optimize reimbursement, adhere to regulatory requirements, and deliver high-quality care to patients.

VII. Future Trends and Updates for CPT Code 93268

The field of cardiovascular monitoring is constantly evolving, with advancements in technology and changes in coding guidelines and regulations. It is essential for medical billing and coding professionals to stay updated with these developments to ensure accurate and efficient reimbursement processes. In this article, we will explore the future trends and updates for CPT Code 93268, which is related to cardiovascular monitoring services.

A. Emerging technologies in cardiovascular monitoring

Advances in technology have revolutionized the field of cardiovascular monitoring, enabling healthcare providers to gather more precise and comprehensive data for diagnosis and treatment. Wearable electrocardiographic monitoring (WEM) is one such emerging technology that has gained significant attention [9]. WEM devices allow patients to undergo long-term monitoring of their heart’s electrical activity, providing valuable insights into cardiac function and detecting abnormalities over an extended period. These devices are non-invasive, convenient, and offer continuous monitoring, which can be particularly beneficial for patients with chronic cardiovascular conditions or those requiring post-operative monitoring.

In addition to WEM, other innovative technologies are also being explored in the field of cardiovascular monitoring. For instance, remote patient monitoring systems equipped with advanced sensors and wireless connectivity enable real-time transmission of cardiovascular data to healthcare professionals. These systems enhance patient engagement, improve the accuracy of diagnosis, and facilitate timely intervention. Furthermore, artificial intelligence and machine learning algorithms are being developed to analyze vast amounts of cardiovascular data, enabling predictive analytics and personalized treatment strategies.

B. Potential changes in coding guidelines and regulations

Coding guidelines and regulations play a crucial role in ensuring accurate reimbursement for healthcare services. As new technologies and procedures emerge, it becomes necessary to update coding frameworks to accommodate these advancements. The American Medical Association (AMA) and other regulatory bodies regularly review and revise Current Procedural Terminology (CPT) codes to reflect the evolving landscape of cardiovascular monitoring [10]. These updates aim to accurately capture the complexity and specificity of new procedures and technologies.

For example, the recent introduction of CPT codes specific to Pediatric/Congenital Cardiology, endovascular repair of congenital heart and vascular defects, and cardiac catheterization for congenital defects highlights the growing importance of specialized coding in the field [10]. These changes enable more accurate reporting and reimbursement for procedures unique to these patient populations.

Apart from procedure-specific updates, changes in the Evaluation and Management (E/M) section of CPT codes also impact cardiovascular monitoring services. The E/M updates aim to streamline documentation requirements, enhance efficiency, and capture the complexity of patient encounters. Medical billing and coding professionals must stay informed about these changes to ensure compliant billing practices.

C. Importance of staying updated with coding and billing changes

In the dynamic field of healthcare, staying updated with coding and billing changes is crucial for medical billing and coding professionals. The evolving landscape of cardiovascular monitoring, with emerging technologies and changing coding guidelines, demands constant vigilance to ensure accurate reimbursement and compliance.

Staying informed about the latest coding updates helps professionals assign the appropriate CPT codes and modifiers to accurately represent the services provided. Accurate coding promotes proper reimbursement and prevents potential claim denials or audits.

Moreover, being knowledgeable about coding changes enables healthcare organizations to optimize revenue management and financial performance. Understanding the intricacies of coding guidelines allows for precise documentation and coding, reducing the risk of revenue leakage and maximizing reimbursement.

Furthermore, regular updates and continuing education in coding and billing help professionals maintain compliance with regulatory requirements. Compliance with coding and billing regulations safeguards against penalties and legal repercussions, ensuring ethical and transparent financial practices.

In conclusion, the future of cardiovascular monitoring is shaped by emerging technologies and evolving coding guidelines and regulations. Staying updated with these changes is vital for medical billing and coding professionals [5]. By embracing emerging technologies, adapting to coding updates, and maintaining compliance, professionals can contribute to accurate reimbursement, efficient revenue management, and high-quality healthcare services.

References:

[1] Cardiac Event Detection Monitoring – CPT 93268, 93270,93271, 93272 with DX LIST | Medicare Payment, Reimbursement, CPT code, ICD, Denial Guidelines (medicarepaymentandreimbursement.com)

[2] CPT® Code 93268 – Cardiovascular Monitoring Services – Codify by AAPC

[3]Cardiac Event Detection Monitoring – CPT 93268, 93270,93271, 93272 with DX LIST | Medicare Payment, Reimbursement, CPT code, ICD, Denial Guidelines (medicarepaymentandreimbursement.com)

[4]Article – Billing and Coding: Electrocardiographic (EKG or ECG) Monitoring (Holter or Real-Time Monitoring) (A57476) (cms.gov)

 [5]CPT® Code 93268 – Cardiovascular Monitoring Services – Codify by AAPC

[6] LCD – Cardiac Event Detection Monitoring (L34953) (cms.gov)

[7] Cardiac Rhythm Management Resources for Medical Reimbursement | Abbott (cardiovascular.abbott)

[8] Heart Failure Resources for Medical Reimbursement | Abbott (cardiovascular.abbott)

[9]Article – Billing and Coding: Long-Term Wearable Electrocardiographic Monitoring (WEM) (A57062) (cms.gov)

[10]New 2022 Cardiovascular CPT Codes: A Quick Rundown – American College of Cardiology (acc.org)

http://www.cms1500claimbilling.com/2017/05/time-span-code-billing-guidelines-93268.html

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